A better application structure

app/converters/cli.py

@@ -0,0 +1,22 @@
+import click
+from . import bp
+from .sandpaper import SandpaperConverter
+
+
+@bp.cli.group('converter')
+def converter():
+    ''' Converter commands. '''
+    pass
+
+@converter.group('sandpaper')
+def sandpaper_converter():
+    ''' Sandpaper converter commands. '''
+    pass
+
+@sandpaper_converter.command('run')
+@click.argument('json_db_file')
+@click.argument('data_dir')
+def run_sandpaper_converter(json_db_file, data_dir):
+    ''' Run the sandpaper converter. '''
+    sandpaper_converter = SandpaperConverter(json_db_file, data_dir)
+    sandpaper_converter.run()